Process for the production of paper cups



Jan. 14, 1930. w. F. HILL PROCESS FOR THE PRODUCTION OF PAPER CUPS Filed March 20, 1928 9 )LNVENTOR Azuel L? ATTORNEY Patented Jan. 14, 1930 UNITED Su sm-rm orrlcs 'WILLOUGHBY I. BILL, OF NECK, NEW YORK PROCESS FOR THE PRODUCTION' OF PAPER CUPS Application. filed March 20, 1926. Serial No. 533,213.

My invention relates to processes'for the production of paper containers and refers particularly to cup-shaped paper containers aving rolled rims.

In the production of paper cups of this character a disc of suitable paper, out from a sheet of any suitable cutting machine, is

passed through crimping-and cup-forming machines, whereby the cup is formed, the

sides of the cup are crimped and the rum portion rolled to form-a strong supporting edge for the device. V

For cups intended for retaining liquids,

- the employed paper must be comparatively impervious to liquids and for such cups a paper treated with paraffin or other suitable material is used.

' For purposes of utility it is necessary to employ a strong thin paper, and asthe several processes -through which it passes durlng the cup production are liable to tear, or rupture it, it is essential that these operations be of such a character as to avoid these injurious results. a

I have found that theedge-rolling step of process can be executed more advantageously, both as to ease of production and su eriority of produced results, if the edge to e rolled is moistenedbefore being subjected to the rolling process.

I have further found that if the central portion of the, paper disc be moistened it cannot be successfully submitted to the cup forming process as it will tear and will not pass through the cup forming machine successfully.

One of the objects of my invention is the step of process which allows of the moistening of a suflicient portion of the outer edge of the disc while maintaining the inner portion of the disc from objectionable moistening.

Another ob'ect of my invention is to treat the paper be ore cutting into discs with an electric prohibitive substance which will prevent the formation of frictionally formed electricity durin the disc cutting operation. In order that evices of this character may be economically manufactured it is necessary that they be made in mass production, .and

hence, a successful method must be one which will allow of rapid manipulation of the devices during their production, which advantageous and valuable attribute is possessed by the process of my invention.

In the accompanying drawings illustrating the following of the process of my invention, similar parts are designated by similar numerals.

Figure 1 is a top view of a pile of prepared sheets having the discs cut therein.

Figure 2 i a section through the line 22 of Figure 1.

Figure 3 is a to view of a pile of discs with water-proof dlscs added thereto.

Figure 4 is a section through the line 33 of Figure 4.

Figure 5, 6, 7 and 8 show modified forms of rolled edges of devices made according to my invention.

One particular method of my invention is as follows The paper in the form of rolls or sheets is treated upon one orboth sides with a substance which acts in the nature of an electric prohibitive to reduce the danger of frictionally formed electrical conditions during the process of crimping and forming and which also acts to render the cup impervious to moisture, and among such substances I have found paraflin to be particularly suitable, although I do not limit myself to this particular product.

A number of sheets, say about 500, are then placed upon each other and a disc of the desired size cut from all of the sheets in the pile at the same time, thus forming a vertical stack of a large number of discs all of the same size.

I then place a water proof disc of suitable material upon the top and under the bottom of the stack and submit it to an atmosphere, the humidity point of which is quite high, the atmosphere containing enough moisture to deposit the same upon the exposed edges of the stacked discs. The amount of humidity is dependent upon the character of the paper employed and-the length of time of treatment and a suitable non-poisonous disinfectant may be employed with the moisture if desired. 1

The discs are retained in the humidifying atmosphere until the moisture has penetrated the discs a suflicient distance from the exposed edges dependent upon the character of the cup to be produced.

The discs arc then removed from the humidif'ying atmosphere and while still moist are subjected to crimping, cup-forming and edge rolling operations.

Figure 1 shows atop VleW of a plurality of sheets of paper 10, 10 piled upon each other, from which a plurality of piles of discs 11, 11 have been out. A water proof disc 12 is placed upon the pile of discs 11, 11 and a water-proof disc 13 is placed below the pile. \Vhcn submitted to a humidifying atmosphere, the edge portions 15, 15 of the discs become moistened. The central portion or each disc is thus retained in a dry condition l.\ av low it to be molded by a die into the bottom 16 and side 17 of a cup, while the moistened edge portion is in condition to be rolled. Figures 5, 6, 7 and 8 show modified forms of rolled edges, 18, 19, 20 and 21, but as my in vention is not directed to any particular form of rolled edges, those shown are given simply as examples, without limiting myself to this particular formation.

It will thus be seen that by the process of my invention, the discs are properly mois tened for edge-rolling purposes while ma1ntaining the central portions thereof in dry condition for crimping and cup-forming and that this moistening step is applied simultaneously to a large number of discs.

In some cases I have found it advisable to surround the stack of paper discs with a moistened cloth while in the humiditying atmosphere in order to obtain the proper quantitv of peripheral moisture.

By proper discs in my specification and claims I mean discs of paper both treated and untreated with electric prohibitive substances.

My invention, therefore, presents a great advancement in the art of making paper containers of the character described and allows of their rapid, efiective'and successful production. I

I do not limit myself to the particular size, shape, number or arrangement of indicated parts or to the particular sequence of steps of operation as these are given simply as a What I claim is 1. In a process for the production of paper cups having rolled edges, the step which com-' prises treating a plurality of paper discs to a humidifying atmosphere, whereby the peripheral portions of said discs will be mois tened and the central portions of said discs pill be protected against said moistening efect.

2. In a process for the production of paper cups having rolled edges, the step which comand a disinfectant. means for clearly describing my inventlon.

prises treating a plurality of superimposed paper discs to a humidifying atmosphere,

whereby the peripheral portions of said discs prises simultaneously subjecting the edges of a plurality of superimposed paper discs to moisture and a disinfectant.

6. In a process for the production of paper cups having rolled edges, the step which comprises simultaneously subjecting the edges of a plurality of superimposed paper discs to a humiditying atmosphere and a disinfectant.

7. In a process for the production of paper cups having rolled edges, the steps which comprise placing a number of sheets of paper upon each other,cutting discs from the thus superimposed sheets and subjecting the thus formed stack of discs to mosphere.

8. In a process for the production of paper cups having rolled edges, the steps which coma humiditying atprise placing a number of sheets of paper upon each other, cutting discs from the thus superlmposed sheets andsubjecting the edges,

of the thus formed stack of discs to moisture.

, 9. In a process for the production of paper cups having rolled edges, the steps which comprise placing a number of sheets of paper upon each other, cutting discs from the thus prise placing a number of sheets of paper upon each other, cutting discs from the thus superimposed sheets and subjecting the edges of the thus formed stack of discs to moisture 11. In a process for the production of paper cups having rolled ed es, the steps which comprise placing a num er of sheets of paper upon each 0ther,-cutting discs from the thus superimposed sheets, subjecting, the thus formed stack of discs to a humidifying atmosphere, crimping and cup-forming each *said disc and rolling the edge of each said 12. In a process for the production of paper cups having rolled edges, the steps which comprise plaeing a number of sheets of paper meaeie upon each other, cutting discs from the thus superimposed sheets, subjecting the edges of the thus formed stack of discs to moisture, crimping and cup-.formingeach said disc and rolling the edge of each said cup.

' 13. In a process for the production of paper cups, the step which comprises treating sheets of paper with an electric prohibitive sub stance, stacking the sheets and cutting a plurality of discs from the thus stacked sheets of paper.

14. In a process for the roduction of paper cups having rolled edges, e steps which comprise treatmg a number of sheets of pa er with an electric prohibitive substance, placing a number of such sheets upon each other, cutting discs from the thus superimposed sheets and subjecting the thus formed stack of discs to moisture.

15. In a process for the production of paper cups having rolled edges, the steps which comprise treating a number of sheets of paper with an electric prohibitive substance, placing a number of such sheets upon each other, cutting discs from the thus superimposed sheets, sub ecting the thus formed stack of discs to moisture and a disinfectant.

16. In a process for the production of paper cups having rolled edges, the steps which comprlse treating a number of sheets of pa er with an electric prohibitive substance, placlng a number of such sheets upon each other, cutting discs from the thus superimposed sheets, subjecting the thus formed stack of discs to moisture, crimping and cup-forming each said disc and rolling the edge of each said cup.

Signed at New York City in the county of New York and State of New York this 19th day of March, 1928.

WILLOUGHBY F. HILL. 

